Mining machine



Sept. 25, 1928.

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M. P. HOLMES MINING MACHINE Original Filed Nov. 1, 1918 8 Sheets-Sheet 81 7/ 47 17 94L 9 I Z9 31 95- i I 9/ g7 26 i: I 146 I i I 14 I 7 l i i Il l 1 l l 14 Z9 I I I I l I l l I I iuvezziorr atz y.

Patented Sept. 25, 192 8.

UNITED STATES PATENT OFFICE.

MORRIS P. HOLMES, OF CLABEMONT, NEW HAMPSHIRE, ASSIGNOB TO SULLIVANMACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS.

Emma MACHINE.

Application filed November 1, 1918, Serial No. 260,708. Renewed November6, 1926.

This invention relates to mining machines, and especially to coal miningmachines of the type comprising a flat cutter bar provided with acontinuously running cutter chain, al-

though not necessarily limited to machines of this type.

The invention has for its general object to provide an improved machineof practical design adapted to cut a kerf in the mine face insubstantially any desired plane within the range of operation of themachine.

Another object of the invention is to provide improved propellingmechanism for machines of the character referred to, whereby the machinemay be propelled from place to pla e about the mine, and whereby thenecessary movements of the machine during the cutting operation may beproduced and controlled.

The foregoing and other objects of the invention, together with meanswhereby the same may be carried into effect, will best be understoodfrom the following description of one form or embodiment thereof which Ihave shown for purposes of illustration in the accompanying drawings.

In said drawings,-

Figure 1 is a side elevation of the complete machine.

Fig. 2 is a plan view thereof.

Fig. 3 is an enlarged longitudinal section taken substantially on theline 3 3. Fig. 2, of the multiple turret head by which the cutter bar ismovably carried.

Figs. 4 and 5 are sections taken substantially on the lines 4-4 and 55,respectively, Fig. 3.

Fig. 6 is a detail view of the means for lock.- ing the cutter bar withrespect to the head.

Fig. 7 is a transverse horizontal section taken substantially on theline 7 7, Fig. 1.

Figs. 8, 9, and 10 are vertical sections taken substantially on thelines 8-8, 99. and 10-10, respectively. Fig. 7, parts being omitted inFigs. 9 and 10.

Fig. 11 is a detail i-rtical section taken subtantially on the line11-11, Fig. 12.

Fig. 12 is a transverse vertical section taken substantially on the line1212, Fig. 1.

Figs. 13 and 14 are transverse vertical sections taken substantially onthe lines 13-13 and 1414, respectively, Fig. 1.

Fig. 15 is a diagrammatic plan View illustrating the operation of themachine in cutting a horizontal kerf in a mine face in the operation ofdriving an entry.

Figs. 16 and 17 are diagrammatic views in, side elevation illustratingthe operation of the machine in undercutting and top cutting,respectively.

Fig. 18 is a diagrammatic view illustrating some of the possibleadjustments of the cutter bar.

Fig. 19 is a diagrammatic plan view illustrating the operation of themachine in shearing, or inserting a vertical kerf in the mine face.

Fig. 20 is a diagrammatic plan view illustrating the use of the machineas a mounted longwall machine.

Fig. 21 is a diagrammatic view, in end elevation, illustrating themachine operating as a mounted longwall machine in cutting an inclinedkerf in a face at one side of the trackway.

Referring first to Figs. 1 and 2, the apparatus as a whole comprises atruck, consisting of a truck body 25 mounted on wheels 26 adapted to runupon a suitable trackway 27, upon which truck is mounted the miningmechanism including a motor casing 28 and a forwardly extending cutterbar 29 provided with the usual cutter chain 30, said cutter bar beingsupported from said casing by means hereinafter more fully described.

In order to permit adjustment of the cutter bar 29 with respect to thetrackway 27 about a transverse horizontal axis, the rear axle 31 of saidtruck, as herein shown, is journaled in boxes 32 (see Figs. 11 and 12)mounted in guideways in depending brackets 34 carried by the truck body25, whereby said axle and truck body are relatively vertically movable,said truck body during such vertical movement turning about the axis ofthe front axle 35. For the purpose of relatively adjusting the truckbody 25 and axle 31 and of retaining the parts in adjusted position,said axle, as herein shown, is provided with a collar 37 (see also Figs.13 and 14) to which is 100 secured. as by a pin 38, a screw 39cooperating with a nut 40 rotatably mounted in an openin; in the top ofthe truck body 25, and retained in place therein by means of annularplates 41 and bolts 42, said nut being provided with a hand wheel 43. Aswill be seen, by rotation of the hand wheel 43 the rear end of the truckmay be raised or lowered with respect to the rear axle 31.

Within the casing 28 is the usual electric or other motor, governed by asuitable controller 44 conveniently accessible to an operator standingupon the platform 45 carried by the truck body, said motor beingsupplied with current through a cable 46 wound upon a reel 47 journaledin uprights 48 carried by the truck body, said reel being electricallyconnected with the motor by conductors 49 and, as is usual in machinesof this character, being rotated by means hereinafter referred to towind up or pay out the cable 46 as the truck is propelled in onedirection or the other along the track 27.

The motor shaft 50 (see Fig. 8) extends rearwardly from the main casing28 into a supplemental casing 51 and has keyed thereto within the lattercasing a pinion 52 and a worm 53, the latter having a hub 54 journaledin a suitable bearing in the casing 51. The worm 53 meshes with a wormgear 55 loosely mounted on a transverse driving shaft 56 (see also Fig.7) said worm gear being adapted to be clutched to said shaft by meanshereinafter described, whereby said shaft may be rotated at a relativelyhigh speed from the motor shaft 50. The shaft 56 is journaled adjacentone end in a bearing 77 carried by the casing 51, and at its oppositeend in a bearing 78 carried by a member 75 forming the opposite end ofsaid casing and secured thereto by bolts 79.

Fast upon one end of the shaft 56 is a sprocket 57 connected by a chain58 (Figs. 1, 2, and 13) with a sprocket 59 on the forward axle 35,whereby, by properly reversing or otherwise controlling the motorthrough the controller 44, the truck may be propelled along the track 27in either direction. Fast upon the opposite end of the shaft 56 is a'drum 60 adapted to receive a cable 61 which may be attached at its freeend to a jack or other fixed support to assist in propelling the truckup steep grades or in other diflicult places. Beyond the drum 60, theshaft 56 is provided with a loose sprocket 62 (see Figs. 2, 13 and 14)adapted to be connected therewith b a suitable clutch 63 and connectedby a 0 Iain 64 with a sprocket on the shaft 65 of the reel 47, wherebysaid reel may be rotated, as above explained, to wind up or pay out thecable 46.

The pinion 52 meshes at opposite sides with gears 66 and 67 (see Fig. 7)loosely mounted on the stub shafts 68 and 69 and having extendedsleeve-like hubs formed with worms 7 0 and 71 (see Figs. 9 and 10) whichmesh, respectively, with worm gears 72 and 73 loosely mounted on theshaft 56 but adapted to be clutched thereto, as hereinafter more fullydescribed. The worms 70 and 71 are of opposite pitch, whereby the wormgears 72 and 73 are rotated in opposite directions, and are preferablyof less steep pitch than the Worm 53, While the gears66 and 67 arelarger than the pinion 52, so that said gears 72 and 73 are-rotated at arelatively slow speed with respect to the speed of rotation of the gear55. The gear 55, when clutched to the shaft 56, is employed forpropelling the truck from place to place about the mine at a relativelyhigh speed, while the gears 72 and 7 3, when clutched to said shaft, areemployed for moving the truck at a relatively slow speed in onedirection or the other during the cutting operation. For selectivelyconnecting the ears 55, 72, and 73 to the shaft 56, and a so fordisconnecting all of said gears and holding said shaft, and consequentlysaid truck, stationary, the following mechanism is provided.

Keyed to the shaft 56 between the gears 55 and 72, is a hub 74 (Fig. 7),while keyed to said shaft between the gear 7 3 and the member 75, is asecond similar hub 76. Interposed between the hub 74 and. the gears 55and 72 are multiple disk clutches 80 and 81, respectively, whileinterposed between the hub 76 and the gear 73 and member are similarclutches 82 and 83. The clutches 80 and 81 may be alternatively set, toconnect the gear 55 or the gear 72 with the hub 74, by means of a clutchcontroller 84 carrying a rotatably mounted trunnion ring 85 operated bya clutch fork 86 controlled by a suitable lever or handle 87 (see Figs.1,2, and 14) at the exterior of the casing 51. Similarly, the clutches82 and 83 are operated, through a clutch controller 88, by a clutch fork89 connected with a lever or handle 90 similar to the lever 87. Byoperating the lever 87 to move the clutch controller 84 in one directionor the other from a neutral position in which the clutches 80 and 81 areboth released, the shaft 56 may be driven by either the gear 55 or thegear 7 2 while by similarly operating the lever 90 to move the clutchcontroller 88, said shaft may be driven through the gear 73, or may beheld stationary by being clutched to the fixed member 75.

For adjustably supporting the cutter bar 29 from the casing 28 in such amanner as to permit said cutter bar to assume a variety of positions andto operate in a plurality of different planes, the following means areprovided.

The casing 28 18 provided at its forward end with a cylindricalextension or hub 91 (see Figs. 3 and 14) on which is rotatably mounted aturret 92 formed with an arm or eccentric, plate-like extension 93.Secured. as by bolts 95, to the eccentric portion 93 of the turret 92,and'forming a part of said turret, is a casing 94 (see also Fig. 13)having a hub 96 on which is rotatably mounted a second turret 97, theaxis of the hub 96, and consequently the axis of rotation of the turret97, being offset with respect to the axis of the hub 91 and turret92'but parallel thereto, as will be clear from the drawings. The turret97 is in turn provided with a hub 98 having its axis transverse to theaxis of the hub 96 but in the same plane therewith, on which hub 98 isrotatably mounted a third turret 99 carrying the cutter bar 29.

For actuating the cutter chain 30 and for controlling the movement ofthe turrets 92 97, and 99 about their several axes, the followingmechanism is provided.

Journaled in the hub 91 is a sleeve 100 keyed or otherwise secured tothe forward end of the motor shaft 50, said sleeve having formed thereona pinion 101 which meshes with a gear 102 having an elongated hub 103journaled in the hub 96 and coaxial therewith. Journaled in the hub 103is a shaft 104 adapted to be connected with the gear 102 for rotationtherewith by means of a suitable clutch 105 adapted to be shiftedlongitudinally of said shaft, to engage or disengage a clutch facethereon with a cooperating clutch face on the gear 102, by means of aclutch fork 106 (Figs. 1 and 2) operated by a suitable clutchcontrolling lever or handle 107. Carried by the forward end of the shaft104 is a bevel pinion 108 meshing with a bevel gear 109 having a hub 110journaled in the hub 98 coaxially therewith. Also rotatably mounted inthe hub 98, and connected with the hub 110 for rotation therewith, isthe hub 111 of the sprocket 112 for driving the cutter chain 30.

The hubs 110 and 111 are keyed to a sleeve 113 within which is rotatablymounted a shaft 114 arranged coaxially with the hub 98 and having fastupon its end a pinion 115 meshing with an idler gear 116 journaled upona disk 117 secured, as by bolts 118, to the turret 99, said gear 116meshing with a gear 119 fast upon a shaft 120 disposed substantiallyparallel to the shaft 114 and journaled in a suitable bearing in theturret 99. Fast upon the shaft 120 is a pinion 121 cooperating with asegmental rack 122 carried by the turret 97.

As will be seen from the foregoing, when the clutch 105 is thrown in toconnect the gear 102 and shaft 104, rotation of the motor shaft 50 willbe transmitted through the pinion 101, gear 102, shaft 104, and gears108 and 109 to the sleeve 113 'and also to the cutter chain sprocket 112to actuate the cutter chain. It will also be seen that by suitablyconnecting the sleeve 113 with the shaft 114 so as to cause rotationofsaid shaft in one direction or the other, motion will be transmittedthrough the pinion 115, gears 116 and 119. and shaft 120 to the pinion121, causing the latter, by cooperation with the segmental rack 122, toswing the turret 99 and cutter bar 29 about the axis of the hub 98. Forso,connecting the sleeve 113 and shaft 114 as to cause rotation of saidshaft in either direct-ion and at different speeds, the followingmechanism is provided.

The sleeve 113 is formed at one end with an eccentric portion 123 (seeFigs. 3 and 5) upon which is rotatably mounted, as by rollers or otherantifriction bearings 124', a ring 125 having formed thereon two spurgears 126 and 127. The gear 127 cooperates with a larger internal gear128 having a hub ke ed or otherwise secured to the shaft 114, while thegear 126 cooperates with a second internal gear 129 formed on a sleeve130'journaled in suitably formed bearings in the turret 97 and in abracket 131 carried thereby. The ratio of the number of teeth on thegear 127 to the number of teeth on the gear 128 is different from theratio of the number of teeth on the gear 126 to the number of teeth onthe gear 129, so that the whole constitutes a compound epicyclicinternal gear train of familiar form. Rotation of the eccentric 123causes the gears 126 and 127 to travel about the interior of the gears129 and 128, whereby, if the gear 129 be held stationary, the unequalratios of the numbers of teeth on the gears of the several couples willcause the gear 128, and consequently the shaft 114, to be rotated at areatly reduced speed with respect to the speed of rotation of the sleeve113, and (if the parts be properly proportioned) in the oppositedirection, and whereby, if the gears 128 and 129 be clutched togetherfor rotation in unison, the unequal tooth ratios referred to will causethe gears to jam, so that the entire train, including the gears 126,127, 128, and 129, together with the shaft 114, will be caused to rotatein unison with the sleeve 113. Means are accordingly provided wherebythe gear 129 may be held stationary or may be clutched to the gear 128,said means being of such a nature as to permit slipping of the partsunder stresses in excess of a predetermined maximum in order to preventinjury to the machine, and, as herein shown, comprising a reversiblefriction device constructed and arranged as follows.

Referring to Figs. 3 and 4, the turret 97 is provided with an openingdisposed in alinement with the shaft 114 and closed by a cap 132 securedto said turret, as by bolts 133, and having an inwardly extendingannular flange 134, while the gear128 is formed with a similar annularflange disposed substantially in alinement with said flange 134. Thesleeve 130 is adapted to be alternatively, clutched to the flange 134 orto the flange 135 by means of friction disk clutches 136 and 137, respectively. Said clutches 136 and 137 are rendered alternatively operativeby means of a clutch controller comprising a ring 138 interposed betweensaid-clutches and connected by trunnions 139 with an annulus 140rotatably mounted in an annular groove in a sleeve 141, said sleeve 141being, for convenience in assembly, formed in two parts in threadedengagement with one another. As the parts are shown in Fig. 3, downwardmovement of the sleeve 141 and clutch controller 138 will renderoperative the clutch 137 to connect the gears 128 and 129, while upwardmovement of said sleeve and controller disengages the clutch 137 andrenders operative the clutch 136 to connect the sleeve 1.30 with theflange 134, thereby holding the gear 129 stationary.

For operating the clutch controlling sleeve 1.41, there is provided asecond sleeve or operating member 142 slidably mounted for longitudinalmovement on a second annular flange 143 projecting inwardly from the cap132 and held against rotation with respect to said cap by means of a pin144 engaging a slot in said flange. For moving the sleeve or member 142longitudinally, there is provided a, screw 145 journaled in the cap 132and providcd exteriorly thereof with a hand wheel 146. The outer end ofthe sleeve 141 is intcriorly threaded to receive a bushing 147whiclnwhen the parts are in neutral or normal position, with bothclutches 136 and 137 disengaged, registers with a nut 148 on theexteriorly threaded outer end of the sleeve 142. The sleeves 141 and 142are provided, respectively, with internal and external shoulders 150 and151, which, when the parts are in the normal or neutral positionreferred to, register with one another, as shown in Fig. 3. Engaging thebushing 147 and nut 148, is a washer 149, while engaging the shoulders150 and 151, is a similar washer 152, and between these washers 149 and152 is interposed a spring 153 located in a recess between the sleeves141 and 142.

As will now be seen by referring to the parts as shown in Fig. 3,downward movement of the sleeve 142 by operation of the hand wheel 146and screw 145 will be transmitted, through the nut 148, washer 149,spring 153, washer 152, and shoulder 150, to the sleeve 141, causingdownward movement of said sleeve and of the clutch controlling ring 138,and thereby rendering operative the clutch 137 to connect the gears 128and 129. Similarly, upward movement of the sleeve 142 will betransmitted through the shoulder 151, washer 152, spring 153, washer149, and bushing 147, to the sleeve 141, causing upward movement of saidsleeve and engagement of the clutch 136 to connect the gear 129 to theflange 134 so as to hold the gear 129 stationary. It will be seen thatmovement of the sleeve 142 in either direction is transmitted to thesleeve 141 through the spring 153, so that the power transmitted throughtheclutches 136 and 137 is limited by the resistance of said spring toyielding under compression, which resistance may be regulated inaccordance with requirements by subjecting said spring to apredetermined initial compresison through suitable adjustment of thebushing 147 and nut 148.

As will now be seen, by a proper adjustment of the hand wheel 146,rotation of the sleeve 113 may be transmitted, through the shaft 114 andintermediate connections, to the pinion 121, which by engagement withthe rack 122 will cause the turret 99 and cutter bar 29 to be swungabout the axis of the shaft 114 and hub 98, said swinging of the turretand cutter bar comprising a relatively slow movement in one direction,ora relatively rapid movement in the opposite direction.

As above explained, the cutter chain 30 is continuously actuated by thesprocket 112, and the setting of the bits in said chain is such, withrespect to the operation of the cutter bar, that the relatively slowswinging movement of said bar constitutes the operative or cuttingmovement thereof, While the relatively rapid swinging movement of saidbar in the opposite direction constitutes the idle or positioningmovement of said bar.

Provision is made whereby the turrets 92, 97, and 99 may all be lockedagainst angular movement about their several axes of rotation, andwhereby the mechanism above described for swinging the turret 99 andcutter bar 29 may also be employed for turning either the turret 92 orthe turret 97 about its axis for the purpose of angular-l positioningsaid turrets in accordance with the requirements. To this end, thefollowing means are provided.

The turret 99 is formed with a hooked flange or lip 154 (Figs. 1, 2, 3,and 6) which extends over a segmental portion 155 of the turret 97adjacent the segmental rack 122. Said segmental portion 155 is formedwith a series of openings 156 adapted to receive a locking pin 157passed through an opening in the lip 154, whereby the turret 99 may belocked, against angular movement, to the turret 97 in any desired anular position. The pin 157 is preferably ormed with a head 158 having aprojection 159 adapted, in any position of the turret 99, to engage asegmental lip 'or flange 160 on the turret 97, whereby said pin may beretained in locking position against accidental dislodgment. As will beclear from Fig. 6, by giving the in a quarter turn, the projection 159may be disengaged from the lip 160, thereby permitting removal of saidpin.

The turret 97 is formed, adjacent the easing 94, with an annular flange161 (Figs. 3 and 13) provided with a circular series of apertures 162adapted to receive a pin or belt 163 engaging an opening in the casin94, whereby the turret 97 can be locke against angular movement to thecasing 94 in an desired adjusted angular position. For similarly lockingthe turret 92 tothe casing 28 in any adjusted angular position,

said turret is provided with an annular flange 164 (Figs. 3 and 14)having a circular series of openings 165 to receive a locking bolt orpin 166.

In order to turn the turret 97 about the axis of the hub 96, the pins157 and 166 are placed in looking position, the pin 163 removed, -andthe hand wheel 146 operated to throw in the clutch 136, therebyrendering operative the transmission connections between the sleeve 113and the pinion 121.

Inasmuch as the pin 157 looks the turret 99 against movement b thecooperative action of the pinion 121 an rack 122, the sleeve 113 willre-ac't through the gear 109 upon the gear 108, causing the former gearto travel about"- proper opening 162 to lock said turret in saidposition. In a similar manner, it will be seen that by insertin thelocking pins 163 and 157 and removingtfie lockin pin 166, the reactionof the gear 109 may transmitted through the shaft 104 to the gear 102 tocause the latter to trigvel about the axis of thehpinion 101, thereangularl positioning t e turret 92 about the axis of the hub 91. Fromthe foregoing, it will be seen that the entire mechanism or cutter barhead shown in Fig. 3 may be turned to any desired angular position byturning the turret 92 about the axis of the hub 91, thatin any angularpgsition of the turret 92 the turret 97may turned to any angularposition about the axis of the hub 96, and that 1n any angular positionof either of the turrets 92 or 97, the turret 99, with the cutter bar,can

.- be swung about the axis of the hub 98. These permissible adjustmentsmake it possible to position the cutter bar to swing in substantiallyany desired plane; u

By reason of the angular ad ustab1l1ty of the turret92 with res t to thecasing 28 and truck about the axis of the hub 91, and the angular adjustability ofthe turret 97 with respect to the turret 92 about the axisof the hub 96, it .will be seen that the cutter bar 29 is capableof-assuming a wide variety of positions in order to swing and to cutkerfs in a wide varietyofplanes. Some of these positions arediagrammatically illustrated in Fig.- 18, whereinA denotes the axis ofrotation of the turret 92, and B, B, B and B denote four positions, 90apart, of the axis of rotation of the turret 97 as the 'turret 92 isrotated about the 'axisA. It will be seen that with the turret 92 soturned as to bring the axis of the turret 97 into position B,

the latter turret may be so turned about its axis as to bring the cutterbar 29 into either of the horizontal positions H or k, or into either ofthe vertical positions V or '0 Similarly, with the turret 92 turned tobring the axis of the turret 97 into the position B the latter turrretcan be turned to bring the cutter bar into the horizontal positions H orh or into the vertical positions V or '0. In the same maner, with theaxis of the turret 97 in the sition B, the cutter bar can occupy theorizontal positions H and k, or the vertical positions V and a; whilewith said axis in the position B, said cutter bar may occupy thehorizontal sitious H or k, and the vertical positions 4 or '0. It willof course be understood that with the cutter bar in any of the positionsindicated, said cutter bar may swing about the axis of the hub 98 in aplane perpendicular to said axis.

to cut a kerf in the mine face in that plane. It'will also be understoodthat, while four positions only of the axis of the turret 97 areillustrated in Fig. 18, the turret 92 may be turned to bring said axisinto any intermediate position on the circle C, and that while certainhorizontal and vertical positions of the cutter bar are indicated insaid figure, the turret 97 may be turned upon its axis to bring saidcutter bar into any intermediate inclined position tangent to a circledrawn about the axis of said turret as'a center, four such circles drawnwith res ect to the positions 13, B, B, and B bein' indicated in Fig. 18by the letters D D and D respectively. It will thus be seen that thecutter bar may be adjusted into substantially any position within thecircle E (which is drawn tangent to and'encloses all of the circles D),and may be disposed at substantially any angle in any of said positionsso as to cut a kerf in substantially any plane within the range of themachine.

A machine arranged as above described. is capable ofa wide variety ofuses. For example, in the operation of entry driving, said vmachine maybe used in accordance with the well known arcwa'll method illustrated inFig. 15. In accordance with this method, the truck having been propelledinto a suitable position in proximity to the face to be cut and broughtinto a stationary position therein, the hand wheel 146' is operated tothrow in the clutch137 and cause the cutter bar 29 to be quickly swunginto the dotted line position F. The clutch 137 is then released andthe'cutter bar locked in this position by the pin 157, aft-er which thelever 87 is o erated'to throw in the clutch 81 and-cause the machine tobe fed towardthe face at slow speed until the cutter bar is brought intothe position shown in full lines in Fig. 13, thereby producin thesumping cut. The clutch 81 is thenre eased and the lever 90 operatedto'engage the clutch 83 and lock the machine in stationary position. Thepin 157 is then removed and the hand wheel 146 operated to engage theclutch 136, thereb causing the cutter bar to be swung slowly rom theposition shown in full lines into the dotted line position G. Finally,the pin 157 is again inserted to lock the cutter bar (the clutch 136having been released), and the lever 90 operated to engage the clutch82, thereby causing the machine to be moved slowly rearwardl andbringing the cutter bar into the dotted line position K to complete theout.

It will be seen that in thus operating, the machine can be caused toinsert, for-example, either horizontal kerfs, as illustrated in Figs. 15and 17, or vertical kerfs, as illustrated in Fig. 19, and that thesekerfs may be cutin substantially any desired plane within the range ofthe machine. Thus, for example, in cutting horizontal kerfs, saidmachine may be used for undercutting, as illustrated in Fig. 16, for topcutting, as illustrated in Fig. 17-, or for inserting a substantiallyhorizontal kerf in any intermediate plane. It will also be seen that bya suitable adjustment of the hand wheel 43 the plane of the cutter barmay be adjusted about a transverse horizontal axis in order to cause thekerf to be out at a slight angle to the horizontal in the direction oftravel of the machine, as indicated in Fig. 16.

In general, it will be seen that a machine has been provided wherein thecutter bar is capable of being adjusted into various positions aboutboth transverse and longitudinal horizontal axes, and that said cutterbar is further adjustable toward and from said last named axis intosubstantially any desired position withinthe range of the machine.

In addition to operating in accordance with the 'arcwall method, asabove described, the machine is also capable of use as a mountedlongwall machine, as-diagrammatically illustrated in Figs. 20 and 21.When so operated, the controlling lever 87 may be adjusted to engage theclutch 80, causing the machine to be propelled at relatively high speedto the end of the face to be cut. Thereafter, the lever 87 may beoperated to disengage the clutch 80, and the lever 90 operated to engagethe clutch 83, thereby locking the truck in position on the track. Thehand wheel 146 may then be operated to engage the clutch 136,

thereby causing the cutter bar 29 to be swung from the dotted to thefull line position in Fig. 20, producing the sumping cut. The hand wheel146 is then operated to release the clutch 136, the locking pin 157inserted to lock the cutter bar in position, and. the lever 90 o eratedto engage the clutch. 82, thereby causing the truck to move slowlyrearwardly along the trackway and the cutter tar to cut the desired kerfin the face.

iihould ithe desired to out such a kerf in a plane maimed to the planeof the trackway, as in following a pitching seam, the bar 29 may bebrought to the desired angle by a suitable adjustment of either theturret 92 or the turret 97 about its axis, as indicated in Fig. 21.

While several uses of the-machine have thus been indicated, these uses bno means exhaust its possibilities, since y reason of its wideadjustability, convenient and flexible control, high power, and sturdyconstruction, many other ways in which the same may be utilized to greatadvantage will be readily recognized by those skilled in the art.

While I have in this application specifically described one form whichmy invention may assume in practice, it will be understood that thisform of the same is shown for purposes of illustration and that theinvention may be modified and embodied in various other forms withoutdeparting from its spirit or the scope of the appended claims.

What I claim as'new and desire to seem a -by Letters Patent is:

1. In a mining machine, in combination, a swinging cutter bar, means foradjustably supporting the same, and common self-contained power operatedmechanism selectively operative to swing said cutter bar or to adjustsaid supporting means to posit-ion said cutter bar said mechanism beingrendered operative to perform either of said functions by presenting itsperformance of theother.

2. in a mining machine, in combination, a movable cutter, means foradjustably supporting the same, common self-contained power operatedmechanism selectively operable to adjust said supporting means'to sitionthe cutter or to move said cutter to'perform the cutting operation, saidmechanism being rendered operative to perform either of said functions bpreventing its performance of the other, and devices for locking saidcutter and said supporting means.

3. In a mining machine, in combination, a movable cutter, means foradjustablysupporting the same, or cunon self-contained mechanismalternatively operative on application of power thereto to move saidsupporting means to position said cutter in different planes or to movesaid cutter to perform the cutting operation, said mechanism including ayielding element and devices for positively locking either said cutteror said supporting means when the other is operated by said mechanism.

4. In a mining machine, in combination, a movable cutter, a rotatableturret by which said cutter is carried, and common self-containedmechanism operative on application of power thereto alternativelyeiai'ier to rotate said turret or to move said cutter thereon.

5. In a mining machine, in combination, a movable cutting mechanism, arotatable turrat by which said cutting mechanism is carried, and commonself-contained means in cluding a train of mechanism operable onapplication of power thereto alternatively either to rotate said turretor to move said cutting mechanism thereon.

6. In a mining machine, in combination, a movable cutting mechanism, arotatable turret by which said cutting mechanism is carried, and commonself-contained means including a single train of mechanism constantlyconnected to said turret and to said movable cutting mechanism andoperable on application of power thereto selectively to rotate theformer or move the latter while the one not moved is stationary.

7. In a mining machine, in combination, a swinging cutter bar, arotatable turret by which said cutter bar is carried, commonselfcontained mechanism alternatively operative on application of powerthereto either to rotate said turret or to swing said cutter barthereon, and devices whereby said cutter bar and turret may be lockedagainst movement.

8. In a mining machine, in combination, a rotatable turret, a swingingcutter bar mounted thereon, common self-contained mechanismalternatively operative on application of power thereto either to rotatesaid turret or to swing said cutter bar, and means for locking saidcutter bar against swinging movement when said turret is rotated.

9. In a mining machine, in combination, a rotatable turret, a swingingcutter bar mounted thereon, means for locking said cutter bar to saidturret, and common self-contained means for swinging said cutter barwhen unlocked from said turret operative on ..pplication of powerthereto to rotate said turret when said cutter bar is locked thereto.

10. In a mining machine, in combination, a rotatable turret having anarcuate series of apertures, a swinging cutter bar mounted on saidturret for swinging movement relative thereto, a pin adapted to engagesaid apertures to lock said cutter bar to said turret against swingingmovement, and common self-contained means for swinging said cutter baroperative on application of power thereto to rotate said turret whensaid cutter bar is locked.

11. In a minin machine, in combination, a rotatable turretiaving anarcuate series of apertures, a swinging cutter bar mounted on saidturret for swinging movement relative thereto, a pin adapted to engagesaid apertures to lock said cutter bar to said turret against swinginmovement, said pin having a. head provid with a locking projection andsaid turret having a flange adapted to overlie said projection. toretain said pin in lockin position, and means for swinging said cutterar, said means being operative to rotate said turret when said pin is inposition to lock said cutter bar.

12. In a mining machine, in combination, a. movable cutter, a rotatableturret by which said cutter is carried, common self-contained mechanismalternatively operative on application of power thereto to rotate saidturret or to move said cutter thereon, and means to lock said turretwhen said cutter is moved.

13. In a mining machine, in combination, a rotatable turret, a swingingcutter bar mounted thereon, common self-contained mechanismalternatively operative either on application of force thereto to rotatesaid turret or to swing said cutter bar, and means for locking saidturret against rotation when said cutter bar is swinging.

14. In a mining machine, in combination, a support havin a circularseries of apertures, a turret rotatably mounted on said support, acutter movably mounted on said turret, common self-contained mechanismalternatively operative on application of power thereto to rotate saidturret or to move said cutter, and a pin adapted to engage saidapertures to lock said turret when said cutter is moved.

15. In a mining machine, in combination, a rotatable turret, a swingingcutter bar mounted thereon, means for locking said cutter bar to saidturret, means to lock said turret against rotation, and commonself-contained means which is operative on application of force theretoboth to swing said cutter bar when said turret is locked and to rotatesaid turret when said cutter bar is locked.

16. In a mining machine, the combination with a plane cutter, of meansfor supporting the same mounted for angular movement about a pluralityof substantially horizontal parallel axes to each of which the plane ofthe cutter remains parallel during movement, said cutter being offset.from one of said axes, and a part of said supporting means being adaptedto describe a. complete circle about one of said axes.

17. In a mining machine, the combination with a plane cutter, of meansfor supporting the same for bodily movement about a plurality ofsubstantially horizontal parallel axes to each of which said supportingmeans maintains the plane of said cutter parallel at all times, saidcutter being offset from one of said axes, and a part of said supportingmeans being adapted to describe a complete circle about one of saidaxes.

18. In a mining machine, the combination with a swinging plane cutterbar, of means for supporting the same for bodily movement about aplurality of substantially horizontal parallel axes to positions inangularly disposed planes each of which is parallel to each of saidaxes, said cutter being offset from said axes and one of said axes beingmovable to trace a. complete surface of revolution about the other.

19. In a mining machine, the combination with a cutter bar, of means forsupporting the same mounted for angular movement about a plurality ofsubstantially horizontal parallel axes,

axes, said cutter bar being offset from one of said axes and beingmounted to swing about an axis transverse thereto to make an arcuate cutwith the edge thereof, and a. part of said supporting means beingadapted to describe a complete circle about one of said axes.

20. In a mining machine, the combination with a cutter bar, of means forsupporting the same mounted for angular movement about a plurality ofsubstantially horizontal, parallel axes, said cutter bar being ofisetfrom one of said axes and being mounted to swing about an axistransverse thereto, and a part of said supporting means being adapted todescribe a complete circle about one of said axes, and means for drivingsaid cutter bar including a shaft coaxial with one of said axes.

21.. In a mining machine, the combination with a cutter bar, of meansfor supporting the same mounted for angular movement about a pluralityof substantially horizontal parallel axes, said cutter bar being ofisetfrom one of said axes and being mounted to swing about an axistransverse thereto, and a part of said supporting means being adapted todescribe a complete circle about one of said axes, and means for drivingsaid cutter bar including shafts coaxial with both of said parallelaxes.

22. In a mining machine, the combination with a cutter bar, of means forsupporting the same mounted for angular movement about a plurality ofsubstantially horizontal parallel axes, said cutter bar being offsetfromone of said axes and being mounted to swing about an axis transversethereto, and a part of said supporting means being adapted to describe acomplete circle about one of said axes, and means for driving saidcutter bar including shafts coaxial with two of said axes.

23. In a mining machine, the combination with a cutter bar, of means forsupporting the same mounted for angular movement about a plurality ofsubstantially horizontal parallel axes, said cutter bar being offsetfrom one of said axes and being mounted to swing about an axistransverse thereto, and a part of said supporting means being adapted todescribe a complete circle about one of said and means for driving saidcutter bar including shafts coaxial with all of said axes.

24. In a mining machine, the combination with a cutter and a drivingmotor, of means fdr supporting said cutter mounted for angular movementabout a substantially horizontal axis, said cutter being offset fromsaid axis, and said supporting means being adapted to describe acomplete circle about said axis, means driven by said motor for movingsaid cutter bodily toward and from said horizontal axis, and means foradjusting said supporting means about a horizontal axis trans verse tosaid first named axis.

25. In a mining machine, the combination with a plurality of relativelymovable supports, of a cutter movable on one of the same, and commonself-contained power operated reaction mechanism whose elementsvariously cooperate to move said cutter relative to said last mentionedsupport and to rotate either of said supports when said cutter is heldin a fixed position.

26. In a mining machine, the combination with a plurality of movablesupports rotatable upon horizontal, laterally offset parallel axes andjointly rotatable upon one of the same through at least ninety degrees,of a cutter carried by one of said supports and movable relative-theretoabout a third axis to cut a plane kerf parallel to said axis.

27. In a mining machine, the combination with a plurality of movablesupports rotatable upon horizontal, laterally offset parallel axes andjointly rotatable upon one of the same through at least ninety degrees,of a cutter carried by one of said supports and movable relative theretoabout a third axis, and power means including a power transmission shaftcoaxial with one of said first mentioned axes for transmitting power tosaid cutter.

28. In a mining machine, the combination with a plurality of movablesupports adjustable about laterally offset, parallel, substantiallyhorizontal axes and jointly adjustable about one of the same, of a kerfcutter movably mounted on one of said supports, and common means forselectively adjusting either to cut a plane kerf parallel to said axesof said supports or moving said cutter while said supports remainstationary.

29. In a mining machine, the combination with a plurality of movablesupports adjustable about laterally ofi'set axes and jointly movableabout one of the same, of a cutter mounted on one of said supports andmovable relative thereto, and common self-com tained power operatedmeans for selectively moving said cutter or adjusting either of saidsupports.

30. In a mining machine, the combination with a support rotatable on ahorizontal axis. of a cutter bar carried by said support and movablerelative thereto about an axis at right angles to the axis thereof, amotor, and

a single self-contained means selectively operable by power from saidmotor either to move said cutter or to rotate said support.

31. In a mining machine, the combination with a movable cutter, ofsupporting means therefor adapted to permit angular adjustment thereofbodily about a plurality of parallel axes, and common self-containedmechanism whose same elements are alternatively operative on applicationof power thereto to move said supporting means to position said cutteror to move said cutter to perform the cutting operation.

32. In a mining machine, the combination with a plane kerf cutter havingcutting elements movable along its length adapted to cut a plane kerf toadmit said cutter, of supporting means therefor adapted to permitangular adjustment thereof about a plurality of parallel horizontalaxes, said cutter being offset from said axes, and said supporting meansbeing adapted to describe a complete circle about either of said axes tochange the plane of cut.

33. In a mining machine, the combination with a machine frame and aswinging cutter bar having cutting elements movable along its lengthadapted to cut a plane kerf to admit said bar, of supporting means forsaid bar adapted to permit angular adjustment thereof about a pluralityof parallel axes disposed longitudinally of said machine frame, saidcutter bar being mounted on said supporting means to swing about an axistransverse to said first named axes.

34. In a mining machine, the combination with a cutter having cuttingelements movable along its length adapted to cut a plane kerf to admitsaid bar, of supporting means therefor comprising a turret rotatable ona substantially horizontal axis, and a second turret mounted on saidfirst named turret for angular movement about an axis eccentric to butparallel with the axis of said first named turret, said cutter beingmovable about an axis perpendicular to the axis of one" of said turretsto cut a plane kerf in the working face.

35. In a mining machine, the combination with a movable cutter, of suporting means therefor comprising a rotate le turret and a second turretmounted on said first named turret for angular movement about an axiseccentric to the axis of said first named turret, and mechanism whosesame elements are selectively operative to rotate either of said turretsor to move said cutter thereon.

36. In a mining machine, the combination with a swinging cutter barhaving cutting elements movable along its length adapted to cut a planekerf to admit said bar, of supporting means therefor comprising a turretrotatable on a substantially horizontal axis and a second turret mountedon said first named turret for angular movement about an axis eccentricand parallel to the axis of said first named turret, said cutter barbeing mounted on said second turret to swing about an axis transverse tosaid first named axes.

37. In a mining machine, the combination with a pivoted cutter, ofsupporting means therefor comprising a turret, a second turret mounteddirectly on said first named turret for angular movement about an axisoffset from but parallel to the axis of said first named turret, saidcutter being mounted on said second turret for swinging movementrelative thereto, and driving connections including members arrangedconcentric with the axes of both of said turrets for operating saidcutter.

38. In a mining machine, in combination, a turret rotatable on ahorizontal axis, a second turret mounted thereon and havin the axisthereof parallel to the axis of sai first mentioned turret, a thirdturret mounted on said second turret, and a cutter carried by said thirdturret and means for operating said cutter including a powertransmission shaft extending along the axis of rotation of said secondmentioned turret.

39. In a mining machine, in combination, a turret, a second turretmounted thereon, a third turret mounted on said second turret, a cutterbar carried by said third turret, means for locking all of said turrets,and mechanism automatically operative to rotate any one of said turretswhen the rotated turret is unlocked and the other turrets locked.

40. In a mining machine, in combination, a turret, a second turretmounted on said first named turret for angular movement about an axiseccentric and parallel to the axis of said first named turret, a thirdturret mounted on said second turret, a cutter carried by said thirdturret, and driving connections including members arran ed concentricwith the axes of said turrets or operating said cutter.

41. In a mining machine, in combination, a turret, a second turretmounted thereon, a third turret mounted on said second turret and havingthe axis thereof so disposed relative to the axis of said firstmentioned turret that said axes maybe arranged erpendicular, a cutterbar carried by said t hird turret, a cutter chain carried by said cutterbar, and driving connections for said cutter chain including membersarranged concentric with the axes of all of said turrets.

42. In a mining machine, in combination, a turret rotatably mounted on ahorizontal axis, a second turret mounted thereon and havin the axisthereof parallel to the axis of sai first mentioned turret, a thirdturret mounted on said second turret, a cutter carried by said thirdturret, and driving connections for actuating said cutter includingreduction gearin connections for angularly moving said third turret.

43. In a mining machine, in combination, a turret, a second turretmounted thereon, a third turret mounted on said second turret, a cutterbar carried by said third turret, a cutter chain carried by said cutterbar, and power driven mechanism for actuatin'g said cutter chain and forangularly moving said third turret including members arranged concentricwith the axes of all of said turrets and reduction gearing for operatingthe turret moving means.

44. In a mining machine, in combination, a turret, a second turretmounted thereon, a third turret mounted on said second turret, a cuttercarried by said third turret, and drivment thereof as a wb ingconnections for actuating said cutter including a compound epicyclicgear train and connections for angularly moving said third turret.

4.5. In a mining machine, in combination, a turret, a second turretmounted thereon, a third turret mounted on said second turret, a cuttercarried by said third turret, and yieldin driving connections extendingthrough said first and second turrets for operating said third turret.

46. In a minin machine, in combination, an angularly ad ustable support,a turret mounted thereon for angular movement about an axis transverseto the axis of movement of said support, a second turret mounted on saidfirst named turret for angular movement about an axis eccentric andparallel to the axis of said first named turret, a third turret mountedmovement about an axis transverse to the axes of said first and secondturrets, and a cutter carried by said third turret.

47. In a mining machine, the combination with a cutter having cuttingelements movable alon its len h adapted to cut a plane kerf to a 't saibar, of supporting means therefor adapted to permit angular move- 0 eabout a plurality of parallel axes to change the plane of cut, and meansfor adjusting said supporting means about an axis transverse to saidfirst named axes.

48. In a mining machine, the combination with a prime mover and cuttingmeans comprising a cutter, means for supporting said cutter ermittingangular adjustment thereof sai cutter bein adapted to cut in planessubstantially aral e1 to the axis of said adjustment and Beingadjustable by saidprime mover toward and from said axis, of a truck forsupportin said cuttin means comprising a body an a lurality o axles, andmeans for ad'usting said body with res t to one of sad axles about theaxis of t e other of said axles to vary the position of the axis ofadjustment of said cutter suplportin means.

49. In a mining machine, t e coin ination with a motor and cutting meanscomprising a cutter, means for supporting the same mount! ed for angularmovement, said cutter being offset from the axis of movement of saidsuporting means and adjustable toward and horn said axis by said motor,and said supporting means being ada ted to describe a complete circleabout sai axis, of a truck for supportin said cutting means, said truckcomprising a dy and a pluralit of axles, and means for adjusting said ywith respect to one of sai axles about the axis of the other of saidaxles to vary the angular position of the axis of said cutter supportingmeans.

50. In a mining machine, the combination with cutting means comprising acutter and on said second turret for angular means therefor adapted tormit angular a 'ustment thereof bodil a ut a plurality 0 parallel axes,of a true for supporting said cutting means, said truck comprising abody and a plurality ofaxles, and means for ad ustin' said body withrespect to one of said axles a ut the axis of the other of said axles tovary the angular position of the axes of said cutter supporting means.

' 51. In a. mining machine, the combination with a truck, of cuttingmechanism thereon including a motor, and transmission and brakingmechanism including a plurality of pairs of friction clutches betweensaid motor and truck adjustable to cause said truck to be support'driven in either direction and at a plurality of speeds or to be heldstationary:

52. In a mining machine, the combination with a truck, of cuttingmechanism thereon including a motor, and transmission and brakimechanism between said motor and truck including a plurality of pairs offriction clutches and a plurality of sets of worm gearing drivingcertain o the same, said mechanism being adjustable to cause said truckto be driven in either direction at a plurality of speeds or to be heldstationary.

53. Ina mining machine, the combination with a truck, of cuttingmechanism thereon including'a motor, a motor shaft, a drivin shaft,means operated by said driving sha t for propelling said trucalternatively operative sets of worm gearing for operatively connectingsaid shafts.

54. In a mining machine, the combination with a truck, of cuttingmechanism thereon including a motor, a motor shaft, a truck drivingshaft, means operated by said driving shaft for propelling said truck,spur gears driven by said motor shaft, a plurality of sets of worm aringdriven by said spur gears, and clutc es between said worm gearing andsaid truck driving shaft.

55. In a mining machine, the combination with a truck, ofcuttingmechanism thereon including a motor, a motor shaft, a drivin Ishaft, means operated by said driving shaf for prospelling said truck, aworm on said motor aft, a worm gear loosely mounted on said drivingshaft and cooperating with said worm, a plurality ofworms dis madwiththeir axes parallel to' the axis 0 said first named worm and operativelyconnected with said motor shaft for rotation thereby, worm gears looselymountel on said driving shaft and cooperating with said last named wormsrespectively, and means for selectively connecting any of said wormgears 'to said drivi shaft to rotate the same.

56. a mining machine, the combination with a truck, of cutting mechanismthereon includinga motor, a motorshaft, a drivin shaft, means operated bsaid driving sha for propelling said true at a cutting speed, a casing,and means in said casing for operand a plurality of' atively connectingsaid motor and driving shaft to actuate the latter or for connectingsaid driving shaft to said casing to hold the same against movement.

57. In a mining machine, the combination with a truck, of cuttingmechanism thereon including a motor, a motor shaft, a driving shaft,means operated by said driving shaft for propelling said truck, acasing, a plurality of sets of worm gearing in said casing foroperatively connecting said motor and driving shafts, and means forselectively rendering operative any of said sets to actuate said drivingshaft or 'for connecting said driving shaft to said casing to hold thesame against movement.

58. In a mining machine, the combination with a truck and cutting meansthereon, of a truck driving shaft, a plurality of friction clutchesconnectable to said shaft, worm gearing operatively connected to anelement of each clutch, a power driven driving member, and gearingreversely driven thereby driving said worm gearing.

59. In a mining machine, the combination with a truck and cutting meansthereon, of a power driven driving element, a truck drivmg shaft, aplurality of clutch mechanisms controlling tbe connection of said shaft,and combined spur and worm gearing, said spur gearing being driven bysaid driving element and sa1d worm gearing being driven by said spurgearing and driving the rotatable elements of said clutches.

60. In a mining machine, the combination with a truck and cutting meansthereon, of a truck driving shaft, a power operated driving member,operative connections between the latter and said shaft including aplurality of clutches adjustable to cause said truc driving shaft tobedriven in either direction and at 'a plurality of speeds or to be heldstationary, a winding drum carried on said shaft, and a flexible memberwound on said drum;

61.. In a mining machine, a cutter mecha-,

nism comprising a swinging cutter bar, a support rotatable through atleast ninety degrees about a horizontal axis perpendicular to theworking face, and a mountin on said support for said cutter bar upon wich said cutter bar is adjustable tocut u on swinging movement thereof aseries 0 intersecting kerfs whose envelope is asurface of revolutionhaving an axis parallel to said horizontal axis but ofi'set therefrom,without movement of said support upon adjustment of said cutter barmounting into any of its difierent operatingpositions.

62. In a mining machine, a main support adjustable throu h at leastninety degrees about a horizon axis, a second su port adjustableabout asecond axis at a fix distance from said first axis, and a swingingcutter bar mounted on said second support, said second support beingadjustable on said first support whereb said bar may swing in the sameplane aralle to said horizontal axis when said t support is in differentadjusted positions relative to said horizontal axis.

63. In a mining machine, a cutter comprising orbitally moving cuttingmeans, and a mounting for said cutter comprising a member rotatableabout an axis at all times parallel to the plane of said orbit and asecond member mounted on said first mentioned member and rotatable withrespect thereto, said second member comprising a pivotal support forsaid cutter and sing operative upon rotation to bring said cutter into aseries of planes in each of which the plane of said orbit shall betagent to the same surface-of revolution.

64. In a mining machine, a cutter mechanism comprising cutting meanstraversing a plane orbit, a mounting. for said cutter comprising amember rotatable about an axis at all times parallel to the plane ofsaid orbit, and means mounted on said member for supporting said cuttermechanism and relative to which said cutter mechanism is swingable tomake a cut, said means being ad'ustable relative to said member so thatsai cutter mechanism may cut, without movement of said member, a seriesof kerfs whose traces on a plane transverse to said axis will lie alongangularly dis osed chords of the circle cut on said plane by the surfaceof revolution generated upon rotationof said cutter mechanism about saidaxis.

65. In a mining machine, the combination with a base movable toward andfrom the work during cutting, a. lane kerf cutter, and means forsupporting t e same on said base including means mounted for angular ad-'ustment about a. plurality of substantially orizontal parallel axesextendin longitudinally of said base, said cutter oing ofis'et from oneof said axes and a part of said supporting means being adapted todescribe a complete circle about one of said axes.

66. In a mining machine, in combination with a base movable toward andfrom a working face during cutting and a cutter bar, of means forsupporting the cutter bar on the base including means mounted forangular movement about a plurality of substantially horizontal axeswhich are parallel to the direction of movement of the base toward andfrom the face, said cutter bar being offset from one of said axes andbeing mounted to swing about an axis transverse thereto and a art ofsaid supporting means being adaptto describe a complete circle about oneof said axes.

67. In a mining machine, a cutter mechanism comprising a swingingcutterbar, a support rotatable through at least ninety degrees about ahorizontal axis perpendicular to the working face, and a mounti on saidsupport for sand cutter bar upon'w ich said bar is adjustable to outupon a swinging movement thereof a series of intersecting kerfs whoseenvelope is a surface of revolution having an axis ofiset from butparallel l to said horizontal axis, without movement of said support.

68. In a mining apparatus, a machine frame movable durlng cutting, aneck rotab able on said frame upon a horizontal axis, a

support carried by said neck and notatable on the latter upon an axisspaced from and bodily rotatable about said first mentioned axis, and aplane cutter bar pivotally mounted on said support, the plane of saidbar being ll always parallel to both of said axes in all positions ofadjustment of said elements.

69. In a mining apparatus, a machine frame movable during cutting, aneck rotatable on said frame upon a horizontal axis, a plane cut- U terbar, and means on which said bar is mounted pivotally connected to saidneck, rotation of said neck and of said bar supporting means on theirrespective axes being operative to position said bar in any horizontalplane between the roof and a plane adjacent the bottom of the mine andwithout longitudinal movement of the bar.

70. In a mining machine, in combination, a base movable towards and froma working 343 face during cutting, a plane cutter bar, a

motor on said base, and means for adj ustably supporting said bar sothat it may insert -kerfs in a multiplicity of horizontal planes withinthe cutting limits of the machine including a pivotal support rotatableon a horizontal axis midway between the vertical cut ting limits of themachine, and a second support carrying said bar and pivotable on aparallel axis carried bv said first mentioned support but offset fromsaid first mentioned axis, said bar being spaced on said secondmentioned support a substantial distance from said second mentionedaxis.

71. In a mining machine, in combination, a base movable towards and froma working face during cutting, a plane cutter bar, a motor on said base,and means for adjustably supporting said bar so that it may insert kerfsin a multiplicity of horizontal planes within the cutting limits of themachine including a pivotal support rotatable on a horizontal axismidway between the vertical cutting limits of the machine, and a secondsupport cariying said bar and pivotable on a par- 7 kerfs in amultiplicity of horizontal planes within the cutting limits of themachine including a pivotal su port rotatable on a horizontal axismidway between the vertical cutting limits of the machine, and a secondsupport carrying said bar and ivotable on a parallel axis carried bysaid rst mentioned support but offset from said first mentioned axis,said bar being spaced on said second mentioned support-a greaterdistance from said second mentioned axis than the distance between saidaxes.

73. In a mining machine, in combination, a base movable towards and froma working face during cutting, a plane cutter bar, a motor on said base,and means for adjustably supporting said bar so that it may insert kerfsin a multiplicity of vertical planes within the lateral cutting limitsof the machine includ ing a pivotal support rotatable on a horizontalaxis midway between the sides of the machine, and a second supportcarrying said bar and pivotable on a parallel axis carried by said firstmentioned support but offset from said first mentioned axis, said barbeing spaced on said second mentioned support a substantial distancefrom said second mentioned axis.

74. In a mining machine, in combination, a base movable towards and froma working face during cutting, a plane cutter bar, a motor on said base,and means for adjustably supporting said bar so that it may insert kerfsin a multiplicity of vertical planes within the lateral cutting limitsof the machine including a pivotal support rotatable on a horizontalaxis midway between the sides of the machine, and a second supportcarrying said bar and pivotable on a parallel axis carried by said firstmentioned support but offset from said first mentioned axis, said barbeing spaced on said second mentioned support a distance from saidsecondmentioned axis different from the distance between said axes.

75. In a mining machine, in combination, a base movable towards and froma working face during cutting, a plane cutter bar, a motor on said base,and means for adjustably supporting said bar so that it may insert kerfsin a multiplicity of vertical planes within the lateral cutting limitsof the machine including a pivotal support rotatable on a horizontalaxis midway between the sides of the machine, and a second supportcarrying said bar and pivotable on a parallel axis carried by said firstmentioned support but offset from said first mentioned axis, said barbeing spaced on said second mentioned support a greater distance fromsaid second mentioned axis than the distance betweensaid axes.

76. In a mining machine, a wheeled base, a support mounted on andmovable with respect to said base, a second support carried by saidfirst mentioned support and movable relative thereto, a cuttingmechanism carried

